ControlLogix Thermocouple Input Module...ControlLogix Thermocouple Input Module 9 Publication 1756-IN037C-EN-P - October 2000 After completing field-side wiring, secure the wires in

Installation Instructions

ControlLogixThermocouple Input Module(Catalog Number 1756-IT6I)

Obtain a User ManualThis product also has a user manual (pub. no. 1756-6.5.9). To view it, visit www.ab.com/manuals or www.theautomationbookstore.com You can also purchase a printed manual by:

• contacting your local distributor or Rockwell Automation representative

• visiting www.theautomationbookstore.com and placingan order

To: See page:Obtain a User Manual 1

Identify the Module Components 2

Prevent Electrostatic Discharge 3

See Removal and Insertion Under Power (RIUP) 3

Understand Compliance to European Union Directive 4

Note the Power Requirements 5

Install the Module 5

Key the Removable Terminal Block/Interface Module 6

Wire the Module 8

Assemble the Removable Terminal Block and the Housing 10

Install the Removable Terminal Block onto the Module 10

Check the Indicators 12

Remove the Removable Terminal Block from the Module 13

Remove the Module 14

See 1756-IT6I Specifications 14

Hazardous Location information 16

Publication 1756-IN037C-EN-P - October 2000

2 ControlLogix Thermocouple Input Module

• calling 800.963.9548 (USA/Canada) or 001.320.725.1574 (outside USA/Canada)

Identify the Module ComponentsYou received the following components with your order:

• 1756-IT6I module

• Removable Terminal Block (RTB) door label

If you did not receive these components, contact your Rockwell Automation sales office.

This module mounts in a ControlLogix chassis and uses a separately-ordered RTB or a Bulletin 1492 Interface Module (IFM) to connect all field-side wiring.

This module uses one of the following RTBs:

• 1756-TBNH 20 position NEMA RTB

• 1756-TBSH 20 position Spring Clamp RTB

Use an extended-depth cover (1756-TBE) for applications with heavy gauge wiring or requiring additional routing space. When using an IFM, consult the documentation that came with it to connectall wiring.

IMPORTANT Before you install your module, you shouldhave already:

• installed and grounded a 1756 chassis and power supply.

• ordered and received an RTB or IFM and its components for your application.


ControlLogix Thermocouple Input Module 3

Prevent Electrostatic Discharge

Removal and Insertion Under Power (RIUP)

ATTENTION

!Electrostatic discharge can damage integrated circuits or semiconductors if you touch backplane connector pins. Follow these guidelines when you handle the module:

• Touch a grounded object to dischargestatic potential.

• Wear an approved wrist-strap grounding device.

• Do not touch the backplane connector or connector pins.

• Do not touch circuit components inside the module.

• If available, use a static-safe work station.

• When not in use, keep the module in its static-shield box.

WARNING

!This module is designed so you can remove and insert it under backplane power and field-side power. When you remove or insert a module while field-side power is applied, you may cause an electrical arc. An electrical arc can cause personal injury or property damage because it may:

• send an erroneous signal to your system’s field devices, causing unintended machine motion or loss of process control.

• cause an explosion in a hazardous environment.

Repeated electrical arcing causes excessive wear to contacts on both the module and its mating connector. Worn contacts may create electrical resistance.

When you insert or remove the module while backplane power is on, or you connect or disconnect the RTB with field-side power applied, an electrical arc can occur. This could cause an explosion in hazardous location installations. Be sure that power is removed or the area is non-hazardous before proceeding.



Understand Compliance to European Union DirectiveIf this product bears the CE marking, it is approved for installation within the European Union and EEA regions. It has been designed and tested to meet the following directives.

EMC Directive

This product is tested to meet Council Directive 89/336/EEC Electromagnetic Compatibility (EMC) and the following standards, in whole or in part, documented in a technical construction file:

• EN 50081-2 EMC - Generic Emission Standard, Part 2 - Industrial Environment

• EN 50082-2 EMC - Generic Immunity Standard, Part 2 - Industrial Environment

This product is intended for use in an industrial environment.

Low Voltage Directive

This product is tested to meet Council Directive 73/23/EEC Low Voltage, by applying the safety requirements of EN 61131-2 Programmable Controllers, Part 2 - Equipment Requirements and Tests.

For specific information required by EN 61131-2, see the appropriate sections in this publication, as well as the following Allen-Bradley publications:

• Industrial Automation Wiring and Grounding Guidelines, publication 1770-4.1

• Automation Systems Catalog, publication B111

This equipment is classified as open equipment and must be installed (mounted) in an enclosure during operation as a means of providing safety protection.



Note the Power RequirementsThis module receives power from the 1756 chasis power supply and requires 2 sources of power from the backplane:

• 250mA at 5.1V dc

• 125mA at 24V dc

Add this current/power value (4.3W) to the requirements of all other modules in the chassis to prevent overloading the power supply.

Install the ModuleYou can install or remove the module while chassis power is applied.

ATTENTION

!The module is designed to support Removal and Insertion Under Power (RIUP). However, when you remove or insert an RTB with field-side power applied, unintended machine motion or loss of process control can occur. Exercise extreme caution when using this feature.

20861–M 20862–M

1. Align circuit board with top and bottom chassis guides.

2. Slide module into chassis until module locking tabs ‘click’.

Printed Circuit Board

Locking tab



Key the Removable Terminal Block/Interface Module Wedge-shaped keying tabs and U-shaped keying bands came with your RTB to prevent connecting the wrong wires to your module.

Key positions on the module that correspond to unkeyed positions on the RTB. For example, if you key the first position on the module, leave the first position on the RTB unkeyed.

Reposition the tabs to rekey future module applications.

Wire the Removable Terminal Block

Wire the RTB with a 5/16 inch (8mm) maximum flat-bladed screwdriver before installing it onto the module.

Shielded cable is required when using this module. We recommend using 14-22 gauge shielded thermocouple cable to wire the RTB.

Connect grounded end of the cable

1. Ground the drain wire.

IMPORTANT We recommend grounding the drain wire at the field-side. If you cannot ground at the field-side, ground at an earth ground on the chassis as shown.

20850–M

1. Insert the U-shaped band as shown.2. Push the band until it snaps in place.

U-shaped bands

1. Insert the wedge-shaped tab with rounded edge first.2. Push the tab until it stops.

20851–M

Wedge-shaped tab

Key the Module Key the RTB/IFM



2. Connect insulated wires to the field thermocouple termination.

Connect ungrounded end of the cable

1. Cut the foil shield and drain wire back to the cable casing and apply shrink wrap.

2. Connect the insulated wires to the RTB (see page 8).

A. Remove a length of cable jacket from the connecting cable.

B. Pull the foil shield and bare drain wire from the insulated wire.

C. Twist the foil shield and drain wire together to form a single strand.

D. Attach a ground lug and apply heat shrink tubing to the exit area.

20104-M

20918-M

E. Connect the drain wire to a chassis mounting tab.

Use any chassis mounting tab that is designated as a functional signal ground.

Chassis mounting tab

Drain wire with ground lug

4M or 5M (#10 or #12) phillips screw and star washer (or SEM screw)

4M or 5M (#10 or #12) star washer

Spring Clamp RTB

A. Strip 7/16 inch (11mm) maximum length of wire.

B. Insert the screwdriver into the inner hole of the RTB.

C. Insert the wire into the open terminal and remove the screwdriver.

NEMA Screw RTB

A. Strip 5/16 inch (8mm) maximum lengthof wire.

B. Turn the terminal screw counterclockwise.C. Wrap wire around the terminal.D. Turn the terminal screw clockwise.



Wire the ModuleYou can only connect wiring to your module through an RTB or IFM. The example below shows how to wire the module.

Connect the Cold Junction Sensor

The cold junction sensor only needs to be installed if you wire the module locally. If you are wiring the module with an IFM, do not connect the cold junction sensor.

IMPORTANT Wire terminal #12 before connecting the cold junction sensor.

#10

#1420908-M

10

12

14

16

9

11

13

15



After completing field-side wiring, secure the wires in the strain relief area with a cable-tie.

20969-M

12

34

56

78

910

1112

1314

1516

1718

1920

+

–

Cold junction sensor

Thermocouple

Wire

IN-0

Not used

RTN-0

IN-2

Not used

RTN-2

Not used

IN-4

Not used

RTN-4

1756-IT6I

IN-0

Not used

RTN-1

IN-3

CJC+

RTN-3

CJC-

IN-5

Not used

RTN-5

Lug

NOTE: If separate power sources are used, do not exceed the specified isolation voltage.



Assemble the Removable Terminal Block and the Housing

Install the Removable Terminal Block onto the Module

WARNING

!The RTB is designed to support Removal and Insertion Under Power (RIUP). However, when you remove or insert an RTB with field-side power applied, unintended machine motion or loss of process control can occur. Exercise extreme caution when using this feature. It is recommended that field-side power be removed before installing the RTB onto the module.

When you remove or insert a module while field-side power is applied, you may cause an electrical arc. An electrical arc can cause personal injury or property damage because it may:

• send an erroneous signal to your system’s field devices, causing unintended machine motion or loss of process control.

• cause an explosion in a hazardous environment.

Repeated electrical arcing causes excessive wear to contacts on both the module and its mating connector. Worn contacts may create electrical resistance.


20852-M

Groove

Groove

Side edge of the RTB

Side edge of the RTB

Strain relief area

1. Align the grooves at the bottom of the housing with the side edges of the RTB.

2. Slide the RTB into the housing until it snaps into place.



Before installing the RTB, make certain:

• field-side wiring of the RTB has been completed.

• the RTB housing is snapped into place on the RTB.

• the RTB housing door is closed.

• the locking tab at the top of the module is unlocked.

20853–M

20854–M

Module guide

RTB guides

Locking tab

1. Align the side and top, bottom RTB guides with the side, top and bottom module guides.

2. Press quickly and evenly to seat the RTB on the module until the latches snap into place.

3. Slide the locking tab down to lock the RTB onto the module.



Check the Indicators

The indicators show CAL status (green) and a bi-colored LED for module "OK" (red/green).

During power up, an indicator test is done and the following occurs:

• The "OK" indicator turns red for 1 second and then turns to flashing green if it has passed the self-test.

This completes installation of the module. Use the information below to remove the module.

LED indicators:

This display:

Means: Take this action:

OK Steady green light

The inputs are being multicast and in normal operating state.

None

OK Flashing green light

The module has passed internal diagnostics but is not actively controlled.

Configure the module.

OK Flashing red light

Previously established communication has timed out.

Check controller and chassis communication

OK Steady red light

The module must be replaced. Replace the module.

CAL Flashing green light

The module is in calibration mode.

None

20962-M

ANALOG INPUT

CAL

OK



Remove the Removable Terminal Block from the Module

Before removing the module, you must remove the RTB.

WARNING

!Shock hazard exists. If the RTB is removed from the module while the field-side power is applied, the module will be electrically live. Do not touch the RTB’s terminals. Failure to observe this caution may cause personal injury.

The RTB is designed to support Removal and Insertion Under Power (RIUP). However, when you remove or insert an RTB with field-side power applied, unintended machine motion or loss of process control can occur. Exercise extreme caution when using this feature. It is recommended that field-side power be removed before removing the module.


20855–M

2. Open the RTB door and pull the RTB off the module.

1. Unlock the locking tab at the top of the module.

42517



Remove the Module

1756-IT6I SpecificationsNumber of Inputs 6 individually isolated channelsModule Location 1756 ControlLogix ChassisBackplane Power Requirements(No external power requirements)

250mA @ 5.1V dc & 125mA @ 24V dc(Total backplane power 4.3W)

Power Dissipation within ModuleThermal Dissipation

4.3W14.66 BTU/hr

Input Ranges -12mV to +78mV-12mV to +30mV (high resolution range)

Supported Thermocouple Types B, E, J, K, R, S, T, N, CLinearization based on ITS-90

Resolution 16 bits (1.4µV typical)0.7µV/bit on high resolution range

Data Format Integer mode (Left justified, 2s complement)Floating point IEEE 32 bit

Input Impedance >10MΩOpen Circuit Detection Time Positive full scale reading within 2sOvervoltage Protection 120V ac/dc maximum

Normal Mode Noise Rejection1 60dB at 60Hz

Common Mode Noise Rejection 120dB at 60Hz, 100dB at 50Hz

Channel Bandwidth1 15Hz

Settling Time to 5% of Full Scale1 <80ms

Calibrated Accuracy at 25°CCalibration Interval

Better than 0.1% of range6 months typical

Accuracy (Cold Junction Sensor)Local CJ Sensor UncertaintyRemote CJ Sensor

For more detailed information, see user manualFrom +/-0.3 up to +/-3.2°C, depending on channel+/-0.3°C

Input Offset Drift with Temperature 0.5µV/degree C typicalGain Drift with Temperature 65 ppm/degree C typical (80 ppm maximum)

1. Push in top and bottom locking tabs. 2. Pull module out of the chassis.

20856–M 20857–M



Additional Notes

The ControlLogix system must be mounted within a suitable enclosure to prevent personal injury resulting from accessibility to live parts. The interior of this enclosure must be accessible only by the use of a tool.

Module Error over Full Temp. Range 0.5% of range

Module Scan Time for all Channels1

(Sample Rate)25ms minimum floating point (millivolt)50ms minimum floating point (temperature)10ms minimum integer (millivolt)

Module Conversion Method Sigma-DeltaIsolation Voltage

Channel to channelUser to system

Optoisolated, transformer isolated100% tested at 1700V dc for 1s, based on 250V ac100% tested at 1700 dc for 1s, based on 250V ac

RTB Screw Torque (NEMA) 7-9 inch-pounds (0.8-1Nm) Module Keying (Backplane) ElectronicRTB Keying User definedField Wiring Arm and Housing 20 Position RTB (1756-TBNH or TBSH)2

Environmental ConditionsOperating TemperatureStorage TemperatureRelative Humidity

0 to 60°C (32 to 140°F)-40 to 85°C (-40 to 185°F)5 to 95% noncondensing

Conductors Wire Size

Category

22-14 gauge (2mm2) stranded2

3/64 inch (1.2mm) insulation maximum23, 4

Screwdriver Width for RTB 5/16 inch (8mm) maximumAgency Certification(when product or packaging is marked)

1 These specifications are notch filter dependent. Values represent 60Hz setting.2 Maximum wire size will require extended housing - 1756-TBE.3 Use this conductor category information for planning conductor routing as described in the system

level installation manual.4 Refer to publication 1770-4.1 “Industrial Automation Wiring and Grounding Guidelines’.

Marked for all applicable directives

Approved Class I, Division 2, Group A, B, C, D

Certified Process Control EquipmentCertified Class I, Division 2, Group A, B, C, D

Marked for all applicable acts

N223

Listed Industrial Control Equipment



This industrial control equipment is intended to operate in a Pollution Degree 2 environment, in overvoltage category II applications, as defined in IEC publication 664A, at altitudes up to 2000 meters without derating.

Hazardous Location information

The following information applies when operating this equipment in hazardous locations:

Products marked “CL I, DIV 2, GP A, B, C, D” are suitable for use in Class I Division 2 Groups A, B, C, D, Hazardous Locations and nonhazardous locations only. Each product is supplied with markings on the rating nameplate indicating the hazardous location temperature code. When combining products within a system, the most adverse temperature code (lowest “T” number) may be used to help determine the overall temperature code of the system. Combinations of equipment in your system are subject to investigation by the local Authority Having Jurisdiction at the timeof installation.

WARNING

!EXPLOSION HAZARD

• Do not disconnect equipment unless power has been removed or the area is known to be nonhazardous.

• Do not disconnect connections to this equipment unless power has been removed or the area is known to be nonhazardous. Secure any external connections that mate to this equipment by using screws, sliding latches, threaded connectors, or other means provided with this product.

• Substitution of components may impair suitability for Class I, Division 2.

• If this product contains batteries, they must only be changed in an area known to be nonhazardous.



Informations sur l’utilisation de cet équipement en environnements dangereux :

Les produits marqués « CL I, DIV 2, GP A, B, C, D » ne conviennent qu’à une utilisation en environnements de Classe I Division 2 Groupes A, B, C, D dangereux et non dangereux. Chaque produit est livré avec des marquages sur sa plaque d’identification qui indiquent le code de température pour les environnements dangereux. Lorsque plusieurs produits sont combinés dans un système, le code de température le plus défavorable (code de température le plus faible) peut être utilisé pour déterminer le code de température global du système. Les combinaisons d’équipements dans le système sont sujettes à inspection par les autorités locales qualifiées au moment de l’installation.

AVERTISSEMENT

!RISQUE D’EXPLOSION

• Couper le courant ou s’assurer que l’environnement est classé non dangereux avant de débrancher l’équipement.

• Couper le courant ou s’assurer que l’environnement est classé non dangereux avant de débrancher les connecteurs. Fixer tous les connecteurs externes reliés à cet équipement à l’aide de vis, loquets coulissants, connecteurs filetés ou autres moyens fournis avec ce produit.

• La substitution de composants peut rendre cet équipement inadapté à une utilisation en environnement de Classe 1, Division 2.

• S’assurer que l’environnement est classé non dangereux avant de changer les piles.






Publication 1756-IN037C-EN-P - October 2000 PN 957424-73Supersedes Publication 1756-5.37 - September 1999 © 2000 Rockwell International Corporation. Printed in USA

Documents

ControlLogix Thermocouple Input Module...ControlLogix Thermocouple Input Module 9 Publication 1756-IN037C-EN-P - October 2000 After completing field-side wiring, secure the wires in